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Old 09-21-2016, 08:37 PM   #1
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Tire pressure and monitors

So we have these Michelin 22.5 radial tires on our Sunova.

Can anyone help explain the correct tire pressure to have with these tires? Camping world checked the pressure in all of my tires and i was with him when he did it. All of them were at 90 pounds. He said they were fine. Is that true?

We also have been looking at buying a tire monitoring system as well.

Any opinions on those if you own one?

What brand do you have?

How it's been working for you?
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Old 09-21-2016, 08:49 PM   #2
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Tire pressures are calculated by getting your coach weights on each axle and then looking up the required pressure from the tire manufacture charts. Use the same pressure for the tires on each axle. The fronts can be different from the back and so forth. Have you had your coach weighed? This is the only way to set the pressures correctly. I have not purchased a tire pressure monitor system but plan to very soon. There are many reviews on the forum for this if you do a search. A popular one on this forum is made by TST but there many other good ones to choose.

http://www.michelinrvtires.com/refer...tion-tables/#/
https://www.rvupgradestore.com/TST-5...-p/92-0406.htm
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Old 09-22-2016, 05:08 PM   #3
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Originally Posted by noserider View Post
Tire pressures are calculated by getting your coach weights on each axle and then looking up the required pressure from the tire manufacture charts. Use the same pressure for the tires on each axle. The fronts can be different from the back and so forth. Have you had your coach weighed? This is the only way to set the pressures correctly. I have not purchased a tire pressure monitor system but plan to very soon. There are many reviews on the forum for this if you do a search. A popular one on this forum is made by TST but there many other good ones to choose.

Michelin RV Tires | View Michelin RV Tires load and inflation tables for motorhomes and recreational vehicles. | Michelin RV Tires
https://www.rvupgradestore.com/TST-5...-p/92-0406.htm
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Old 09-22-2016, 05:14 PM   #4
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Until you can get a 4 corner weight take the coach to a truck stop with a scale and get axle weights for now. Once you have the axle weight divide it by 2 and that will be close. Then use the Michelin pressure chart and add 5lbs. to what it says for now.
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Old 09-22-2016, 05:21 PM   #5
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Re: Monitors

I have been using Pressure Pro nearly 9 years and am very pleased. I have 6 on the coach and 4 on the toad. I carry an "o" ring kit and a couple of extra sensors. Always reliable. Sure makes it easy to check your pressure and an alarm sounds if there is an issue. The monitor indicates where the issue is.
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Old 09-22-2016, 05:24 PM   #6
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Agree with the above, but until you can even get to a CAT scale, find the placard that shows your tire sizes for front and rear, and shows the recommended pressures which are based in the max. weight per axel. As long as you are not overweight, this is the safe place to start. The only drawback could be as slightly harsh ride, but you will be safe. My guess / hope is, that the 90#s that you are now set at, is based on that placard......

My tire placard is on the inside of my entry door frame. (It is very similar to what you have on your car, most likely on the driver's door frame).

You may also want to start a bit higher (2-5#s) now than the placard (as long as it is less than the sidewall stated max) if you are staying in an area where ambient temperature will dropping as fall comes on, as your cold pressures will drop as well.

I have a TST monitor for the catch and toad.

Regards
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Old 09-22-2016, 10:24 PM   #7
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Have been using a TST 507 monitor for the last couple months and it works great! So far on the coach only, will be adding to toad soon.
My rig uses the same 22.5 XRV's on a 36' Bounder. I am a believer in less rolling resistance. I get the 4 corner weights on my rigs to "know" how its distributed. However I keep my tire pressures at 10 lbs below max in FLA summer. Because in the first 30 mins of driving down here they all increase by 8 - 12 lbs. 110psi (cold) being max for my XRVs. In cooler weather I will narrow the margin. The monitor is a great tool for watching how your tire pressures can vary based on conditions. I notice no difference in harshness on the firmer tires. There is a lot of cush built into those XRV's.
There was a time when I adjusted my tire pressures lower in the front based on actual weights but felt the steering was mushier and had more wander/squirm. Once you are weighed you can make your own adjustments to find your happy place. Safe Travels!
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Old 09-22-2016, 10:50 PM   #8
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There should be a MFG plate somewhere around the coach (usually in the driver area) that will tell you the proper inflation for your coach. Just because the tire takes 90 psi does not mean that is it the recommended PSI for your application. Remember these are commercial truck tires. The same tires are under UPS trucks, Uhaul's, and in some cases the same tires are even used on dump trucks and buses. Your application will vary or as often said and really applies in this case "Your mileage may vary".
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Old 09-23-2016, 11:11 PM   #9
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Thanks for all the information. Time to get this thing weighed so I can get the pressures right.

I've done some research and like this monitoring system and its features. Anyone using this system and have an opinion.

EEZTIRE T515/SP TIRE PRESSURE AND TEMPERATURE MONITORING SYSTEM
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Old 09-23-2016, 11:30 PM   #10
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it is not clear with your pic if you have metal valve stems, if not you may want to change them before you put a mass on the end that will be swinging in the wind...
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Old 09-23-2016, 11:51 PM   #11
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Quote:
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it is not clear with your pic if you have metal valve stems, if not you may want to change them before you put a mass on the end that will be swinging in the wind...
The ones shown are flow through sensors. They also have non flow versions as well. Not sure which I'm going to use yet.
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Old 09-24-2016, 06:32 AM   #12
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We are using the same TPMS. We've had it for a year. We have 6 flow through on the coach and 4 anti theft on the toad. The flow throughs are convenient, you don't have to remove them to add air.
I like them when they work, but so far it seems to be unreliable. Periodically a sensor will stop reporting. We've talked to tech support and they were very helpful. It is susceptible to interference from other electronics, in particular a wireless thermometer that we have. So, moving stuff around on the dash has helped, but has not totally fixed the problem.
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Old 09-28-2016, 12:33 PM   #13
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We are using the same TPMS. We've had it for a year. We have 6 flow through on the coach and 4 anti theft on the toad. The flow throughs are convenient, you don't have to remove them to add air.
I like them when they work, but so far it seems to be unreliable. Periodically a sensor will stop reporting. We've talked to tech support and they were very helpful. It is susceptible to interference from other electronics, in particular a wireless thermometer that we have. So, moving stuff around on the dash has helped, but has not totally fixed the problem.
Do you have any experience with the non flowthrough's at all?
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Old 09-28-2016, 02:48 PM   #14
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Yes, the anti theft and non flow through are the same.
They drop out just like the others. They are easy to get on and off. They do e with a little tool to take them off or put on, although you really don't need it. The head of it spins freely from the rest of it, but if you torque it a little you can put it on and off without the tool. So, the anti theft feature is easily defeated.
The flow through are actually a little more difficult to get on and off. They are secured with a little set screw.
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